<template>
  <div class="app-container">
    <el-form label-width="120px">

      <!-- 描述标签 -->
      <el-form-item label="信息描述">
        <el-tag type="info">excel模版说明</el-tag>
        <el-tag>
          <i class="el-icon-download" />
          <a :href="'/static/01.xlsx'">点击下载模版</a>
        </el-tag>
      </el-form-item>

      <!-- 上传组件 -->
      <el-form-item label="选择Excel">

        <!--
            :on-success 成功回调函数
            :on-error  失败回调函数
            :disabled  上传按钮是否禁用
            :limit   可以上传多少个文件
            :action  直接请求地址
            name  上传的文件名
            accept  可以上传的文件类型
         -->
        <el-upload
          ref="upload"
          :auto-upload="false"
          :on-success="fileUploadSuccess"
          :on-error="fileUploadError"
          :disabled="importBtnDisabled"
          :limit="1"
          :action="BASE_API+ '/eduservice/subject/addSubject'"
          name="file"
          accept="application/vnd.ms-excel"
        >
          <el-button slot="trigger" size="small" type="primary"
          >选取文件</el-button
          >
          <!--
                上传按钮
                :loading  是否显示加载框
                submitUpload 加载提交函数
           -->
          <el-button
            :loading="loading"
            style="margin-left: 10px"
            size="small"
            type="success"
            @click="submitUpload"
          >上传到服务器</el-button
          >
        </el-upload>
      </el-form-item>


    </el-form>
  </div>
</template>
<script>
  export default {
    data() {
      return {
        BASE_API: process.env.VUE_APP_BASE_API,   // 接口API地址
        importBtnDisabled: false,         // 按钮是否禁用,
        loading: false,
      };
    },
    created() {},
    methods: {
      //点击按钮上传文件到接口里面
      submitUpload() {
        this.importBtnDisabled = true;
        this.loading = true;
        // 相当于 js: document.getElementById("upload").submit()
        this.$refs.upload.submit();
      },

      //上传成功
      fileUploadSuccess(response) {
        this.importBtnDisabled = false;
        //提示信息
        this.loading = false;
        this.$message({
          type: "success",
          message: "添加课程分类成功",
        });
        //跳转课程分类列表
        //路由跳转
        this.$router.push({ path: "/subject/list" });
      },

      //上传失败
      fileUploadError() {
        this.loading = false;
        this.importBtnDisabled = false;
        this.$message({
          type: "error",
          message: "添加课程分类失败",
        });
      },
    },
  };
</script>

